Earth spaceports in Orbiter2016

OrbitMFD showing the earth (gray) as well as the ship's orbit (green) and ISS orbit (yellow)

OrbitMFD is an MFD that comes with the stock installation of Orbiter. It provides a graphical and numerical representation of a ship's orbit.

Credits

OrbitMFD is supplied with the stock installation of the Orbiter Spaceflight Simulator as provided by Dr Martin Schweiger and has been a part of the simulator since its inception.

Operation

OrbitMFD graphically shows the orbit of the ship in green and if a target is selected, the target's orbit, and a celestial body, typically the body with the most gravitational influence on the ship. Any body in the simulator can be selected to show the relation of the orbit to that body. In addition it will show a number of parameters. Pressing the SEL button on an MFD, OrbitMFD is the first MFD in the menu. The graphics will also display the ascending node with a solid square along the orbit, the descending node with an open square with a dotted line between the two, also the apoapsis with an open circle and periapsis with a solid circle. In addition, in the bottom center of the MFD, 'G' will show the amount of gravitational influence of the reference body (0 to 1.00), and will be green greater than 0.50, yellow less than 0.50.

OrbitMFD
Button	HotKey	Description
Orbit	X	The body about which the ship is orbiting automatically the body with the greatest gravitational influence on the ship, any body may be selected.
REF	Shift+R	Select the orbit reference body.
AR	Shift+A	OrbitMFD will select the reference body automatically, the body with the greatest gravitational influence on the ship.
TGT	Shift+N	Select a target vessel or natural body orbiting the same reference body.
NT	Shift+N	Deselects the target so that there is no target vessel or body.
MOD	Shift+M	Changes the display mode: Graphics + parameters, graphics only, or parameters only.
FRM	Shift+F	Frame of reference, equatorial or ecliptic.
PRJ	Shift+P	Orbital projection, reference frame, or ship's and target's frame.
DST	Shift+D	Switches parameters to distance from center of body or to altitude of mean radius of body.
HUD	Shift+H	Switches HUD to Orbit mode.

OrbitMFD orbital parameters
Name	Parameter	Description
SMa	Semimajor axis (m, km, AU)	One-half the length of the long axis of the orbit
SMi	Semiminor axis (m, km, AU)	One-half the length of the short axis of the orbit
PeR PeA	Periapsis radius (m, km, AU) Perapsis altitude (m, km, AU)	By selecting DST:Periapsis distance from the center of the body Periapsis altitude from mean radius.
ApR ApA	Apoapsis radius (m, km, AU) Apoapsis altitude (m, km, AU)	By selecting DST:Apoapsis distance from the center of the body Apoapsis altitude from mean radius.
Rad Alt	Ship's current radius (m, km, AU) Ship's current altitude (m, km, AU)	By selecting DST:Ship's current distance from the center of the body Ships current altitude from mean radius.
Ecc	Eccentricity	Circular = 0, Elliptical o - 1, Hyperbolic >1
T	Period of Revolution (seconds)	How long it takes to go once around
PeT	Time remaining until Periapsis (seconds)	Time until the next low point in orbit
ApT	Time remaining until Apoapsis (seconds)	Time until the next high point in orbit
Vel	Velocity (m/s)	How fast the ship is going in its orbit
Inc	Inclination (°)	Orbital tilt from equator/ecliptic
LAN	Longitude of Ascending Node (°)	Measured from Vernal Equinox
LPe	Longitude of Periapsis (°)	Measured from Varnal Equinox
AgP	Argument of Periapsis (°)	Angle from ascending node to periapsis
TrA	True Anomaly (°)	Angle along the orbit from periapsis to current position
TrL	True Longitude (°)	Angle along the orbit from periapsis to current position if the inclination = 0
MnA	Mean Anomaly (°)	Angle along the orbit from periapsis to current position if the orbit were circular
MnL	Mean Longitude (°)	Angle along the orbit from periapsis to current position if the orbit were circular

• Semimajor Axis
• Semiminor axis
• Longitude of Ascending Node
• Longitude of Periapsis
• Argument of Periapsis
• Eccentricity
• Mean Anomaly
• Eccentric Anomaly
• True Anomaly
• True Longitude
• Mean Longitude